#include <unistd.h>
#include <stdio.h>
#include <dirent.h>
#include <string.h>
#include <sys/stat.h>
#include <stdlib.h>

void printdir(char *dir, int depth)
{
    DIR *dp;
    struct dirent *entry;
    struct stat statbuf;

    if((dp = opendir(dir)) == NULL){
        fprintf(stderr, "cannot open directory: %s\n", dir);
        return;
    }
    chdir(dir);
    while((entry = readdir(dp)) != NULL){
        lstat(entry->d_name, &statbuf);
        if(S_ISDIR(statbuf.st_mode)){
            /* Found a directory, but ignore . and ..  */
            if(strcmp(".", entry->d_name) == 0 ||
                strcmp("..", entry->d_name) == 0)
                continue;
            printf("%*s%s/\n", depth, " ", entry->d_name);
            /* Recurse at a new indent level */
            printdir(entry->d_name, depth+4);
        }
        else printf("%*s%s\n", depth, " ", entry->d_name);
    }
    chdir("..");
    closedir(dp);
}

int main(int argc, char* argv[])
{
    char *topdir = ".";

    if(argc >= 2)
        topdir = argv[1];

    printf("Directory scan of %s:\n", topdir);
    printdir(topdir, 0);
    printf("done.\n");

    exit(0);
}
